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作者提出采用一种孔底反循环深井钻进装置。该装置能够在钻具上下运动时防止封隔器磨损。整个装置(见附图)由岩石破碎器、取心装置(部件2—4)、保径扩孔器5、封隔器6、扩孔器7组成,在直径与扩孔器直径相等的井孔中,因为保径扩孔器5和封隔器6的直径小,不接触孔壁,所以在起下钻时就不会受磨损。钻进到孔底后,岩石破碎器、保径扩孔器、封隔器进入超前孔。钻进过程中,岩石破碎器所钻成的井筒又由保径扩孔器5扩
The authors propose a hole bottom reverse circulation deep well drilling device. The device prevents packer wear as the drill moves up and down. The whole device (see the attached drawings) consists of a rock breaker, a coring device (part 2-4), a gage reamer 5, a packer 6, and a reamer 7. In a well with a diameter equal to the diameter of the reamer In the hole, because the diameter of the broach 5 and the packer 6 are small and do not contact the hole wall, they will not be worn down during drilling. After drilling into the bottom of the hole, rock crusher, gauge reamer, packer into the advance hole. During the drilling process, the wellbore drilled by the rock breaker is expanded by the gage reamer 5